Update README.md

Author: satr

README.md

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 # amazon-lex-access-with-rest-api-from-java-app
 Example of the connection to the Amazon Lex bot with REST API from Java application
+
+Amazon Lex Documentation:
+https://aws.amazon.com/documentation/lex/
+
+Documentation for AWS SDK for Java:
+http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/index.html
+
+IAM AWS Console: users:
+https://console.aws.amazon.com/iam/home?region=us-east-1#/users
+
+Lex AWS Console:
+https://console.aws.amazon.com/lex/home?region=us-east-1#
+
+Java web-client and json libraries
+```
+cxf-bundle-jaxrs
+jackson-jaxrs-json-provider
+```
+
+Authentication and Access Control for Amazon Lex:
+http://docs.aws.amazon.com/lex/latest/dg/auth-and-access-control.html
+
+Signature Version 4 Signing Process:
+http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html
+
+Signing AWS Requests with Signature Version 4:
+http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html#sigv4_signing-steps-overview
+
+Examples of the Complete Version 4 Signing Process (Python):
+http://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html
+
+Examples of How to Derive a Signing Key for Signature Version 4:
+http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html
+
+Best Practices for Managing AWS Access Keys (not recommended to keep them in the code):
+http://docs.aws.amazon.com/general/latest/gr/aws-access-keys-best-practices.html
+
+Troubleshooting AWS Signature Version 4 Errors:
+http://docs.aws.amazon.com/general/latest/gr/signature-v4-troubleshooting.html
+
+Amazon Lex API Reference (endpoints):
+http://docs.aws.amazon.com/lex/latest/dg/API_Reference.html
+
+